I don't fell like sleeping what is the most creepy/gory/bloody anime /a/
BTW needs a good plot.
Another is pretty good you should check that out.
I'll be nice and suggest Shiki for a creepy atmosphere.
This show called Another that aired a couple seasons back should be right down your alley, OP.
Edgies can't be choosers
There haven't been that many recently,
Have you heard about 'Another' though? It came out a couple seasons back, that fits your description fairly well actually.
If you don't need the gore and are up for psychological horror, maybe Buko no Pico will float your boat.
Try Umineko no Naku Koro ni and Higurashi no Naku Koro ni.
They're pretty gory and it's pretty psychological.